Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 95, NWS Shreveport, LA

November 8, 2011Jackson Parish, Ouachita Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Nov 8, 2011, 8:34 PM CST for Jackson Parish, Ouachita Parish, Louisiana. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Nov 8, 2011, 8:34 PM CST (02:34 UTC)
Expired: Nov 8, 2011, 9:15 PM CST
In force: 41 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Jackson Parish, LA, Ouachita Parish, LA

The radar

The Shreveport radar (KSHV), 154 km from the middle of the area, began a volume at 02:36 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Nov 8, 5:30 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 2.6 hours before the alert went out and 199 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 107 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 1030 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 107 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

473 
WFUS54 KSHV 090234
TORSHV
LAC049-073-090315-
/O.NEW.KSHV.TO.W.0095.111109T0234Z-111109T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
834 PM CST TUE NOV 8 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL JACKSON PARISH IN NORTH CENTRAL LOUISIANA...
  OUACHITA PARISH IN NORTH CENTRAL LOUISIANA...
  THIS INCLUDES THE CITIES OF...WEST MONROE...SWARTZ...MONROE...
  CLAIBORNE...BROWNSVILLE-BAWCOMVILLE...

* UNTIL 915 PM CST

* AT 832 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 16 MILES
  SOUTHWEST OF BROWNSVILLE-BAWCOMVILLE...MOVING NORTHEAST AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  RICHWOOD AND STERLINGTON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE
STORM. A TORNADO MAY ALREADY BE ON THE GROUND...OR IS EXPECTED TO
DEVELOP SHORTLY. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...
MOVE INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM
WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
STURDY SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST
DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

&&

LAT...LON 3227 9228 3228 9231 3226 9231 3222 9237
      3235 9252 3268 9212 3269 9209 3271 9207
      3255 9190 3252 9190
TIME...MOT...LOC 0234Z 229DEG 25KT 3234 9237

$$

VII

1 follow-up statement

555 
WWUS54 KSHV 090301
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
901 PM CST TUE NOV 8 2011

LAC049-073-090315-
/O.CON.KSHV.TO.W.0095.000000T0000Z-111109T0315Z/
OUACHITA LA-JACKSON LA-
901 PM CST TUE NOV 8 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CST FOR JACKSON
AND OUACHITA PARISHES...

AT 857 PM CST...WIDESPREAD THUNDERSTORMS...CAPABLE OF POSSIBLY 
PRODUCING A TORNADO...COVERED MOST OF THE WARNED AREA. THESE STORMS
WERE MOVING TO THE NORTHEAST AROUND 30 MPH. 


LAT...LON 3227 9228 3228 9231 3226 9231 3222 9237
      3235 9252 3268 9212 3269 9209 3271 9207
      3255 9190 3252 9190
TIME...MOT...LOC 0300Z 229DEG 25KT 3246 9221

$$

VII

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 8, 6:00 PM CST	Tornado Warning	SHV	Bienville, Bossier, Webster	45 min
Nov 8, 6:06 PM CST	Severe Thunderstorm Warning	SHV	Claiborne, Union, Webster	39 min
Nov 8, 6:42 PM CST	Tornado Warning	SHV	Bienville, Claiborne, Lincoln, Webster	48 min
Nov 8, 7:26 PM CST	Severe Thunderstorm Warning	SHV	Bienville, Claiborne, Jackson, Lincoln, Ouachita, Union	64 min
Nov 8, 8:37 PM CST	Tornado Warning	SHV	Grant, Natchitoches, Sabine	38 min
Nov 8, 9:31 PM CST	Areal Flood Advisory	SHV	Ouachita	119 min

Nearby

Tornado Warnings in Louisiana, 2011 Every tornado warning in 2011 Tornadoes in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.